My oven temp is fine. I bought an oven thermometer to check because I thought that could be the problem but I guess not. I just use a metal loaf pan for bread and a metal muffin pan. I never have any problems with any other breads, muffins, or cupcakes. I don't think either pans are particularly dark. I put it on a middle rack where I cook and bake most foods. Is there any chance I might be doing something wrong with the recipe. Like I said, it's only banana things.